To prevent nosebleeds, the Washington University Sinus Institute recommends humidifying the home, keeping the temperature low, using saline nasal sprays and ointments for the inside of the nose, and avoiding injury to the nose from forceful blowing, rubbing or nose picking. Stopping smoking and avoiding the use of cold and allergy medications are also strongly suggested.
According to WebMD, most nosebleeds are not serious and do not require professional medical treatment. Common causes of mild nosebleeds include low humidity, cold or dry climates, smoke, chemical fumes, and injury to the nose. Medical problems, such as high blood pressure, liver disease, kidney disease and blood clotting disorders, may also increase the likelihood of nosebleeds.
For home treatment of a nosebleed, WebMD suggests having the person sit upright and lean slightly forward while firmly pinching the nose with the thumb and index finger. After applying pressure for five full minutes, the bleeding should stop, but if it hasn't, the process may be repeated for another five minutes.
There are some circumstances where it is advised to contact a health care professional. The National Library of Medicine recommends seeking emergency care if the nosebleed accompanies a head injury, if bleeding does not stop after 20 minutes or if nosebleeds occur often.